That was the beginning of a string of insults LeMond fired against Armstrong during the interview, which included calling him a thug and a fraud and saying he should go to jail. This was the first time LeMond spoke publicly against Armstrong since his confession last January.

On Monday, his tune had changed. LeMond claimed that the doping problem has ruined professional cycling and that Armstrong manipulated the cancer community.

When Cooper asked LeMond if he considered Armstrong to be the greatest fraud in sports history, he stated:

Absolutely. Absolutely. The greatest fraud was that—I mean, I know his physical capability. He is a top 30 at best. I mean, at best. No matter what. If he was clean, everybody was clean, he was top 30 at best. He is not capable of, not capable of the top five.

LeMond is now the only American who officially won the Tour de France, in 1986, 1989 and 1990. He is known as a vocal anti-doping campaigner and had accused Armstrong of doping dating back to the early 2000s.

Armstrong was exposed of doping during his cycling career. After years of accusations, he officially admitted to his offenses to Oprah Winfrey in January.

Armstrong was formally stripped of the seven Tour de France Titles he won between 1999 and 2005. Last month, he returned his bronze medal from the Sydney Olympics in 2000.

While Armstrong's cycling days, along with his violations and subsequent admissions, may be behind him, his critics continue to be present. LeMond's comments are just the latest reminder that Armstrong's actions have left behind an ugly mess that will be difficult to wash away.